HUMAN CARDIOLIPIN AS THE ANTIGEN IN AN ELISA TO DETECT ANTICARDIOLIPIN ANTIBODIES

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Abstract
Human cardiolipin was purified from cadaver heart tissue and used as the antigen in an enzyme-linked immunoassay (ELISA) for anticardiolipin antibodies. The correlation between assays using human and bovine cardiolipin was r=0.90. Of the lupus anticoagulant positive patients 88% had antibodies to the human antigen and 75% had antibodies to the bovine antigen. Six of 45 samples contained antibodies which only reacted with the human antigen. All six samples remained positive when retested with a different human cardiolipin preparation and were negative when tested against a preparation of sheep cardiolipin. These studies suggest that there was increased specificity when human cardiolipin was used as the phospholipid antigen.

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